Corrected platform check order

codec.m

@@ -16,20 +16,20 @@ decode = codecp.Results.decode;
 
 %% Select executable according to coding choice and OS
 if encode
-    if ispc
-        TApp = fullfile(HEVCDir,'bin','TAppEncoder.exe');
+    if ismac
+        error('Platform not yet supported')
     elseif isunix
         TApp = fullfile(HEVCDir,'bin','TAppEncoderStatic');
-    else
-        error('Platform not supported')
+    elseif ispc
+        TApp = fullfile(HEVCDir,'bin','TAppEncoder.exe');
     end
 elseif decode
-    if ispc
-        TApp = fullfile(HEVCDir,'bin','TAppDecoder.exe');
+    if ismac
+        error('Platform not yet supported')
     elseif isunix
         TApp = fullfile(HEVCDir,'bin','TAppDecoderStatic');
-    else
-        error('Platform not supported')
+    elseif ispc
+        TApp = fullfile(HEVCDir,'bin','TAppDecoder.exe');
     end
 else
     warning('Nothing to do');